Please explain in details those situations below

1) A enters into a contract with B to purchase B's house. Under this contract, A gives B an earnest money payment of $5,000. Later, they both change their minds (mutual consent) and want to get out of the contract. Which of the following methods can discharge this contract: specific performance, substantial performance, novation, rescission and restitution, promissory estoppel? Explain 2) A enters into a contract with B to purchase B's house. Under this contract, A gives B an earnest money payment of $5,000. Later, B decides he does not want to sell the house and breaches the contract. A and his family really, really want the house. Which of the following remedies should a sue for: quasi - contract enforcement, novation, rescission and restitution, specific performance, assignment of the contract, or delegation of the contract? Explain